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add round-robin arbiter

pull/1/head
parent
commit
e14031fba6
  1. 24
      heavycomps/heavycomps/roundrobin.py

24
heavycomps/heavycomps/roundrobin.py

@ -0,0 +1,24 @@
from nmigen import *
class RoundRobin:
def __init__(self, n):
self.n = n
self.request = Signal(n)
self.grant = Signal(max=n)
def elaborate(self, platform):
m = Module()
n = self.n
if n > 1:
with m.Switch(self.grant):
for i in range(n):
with m.Case(i):
with m.If(~self.request[i]):
for j in reversed(range(i+1, i+n)):
t = j % n
with m.If(self.request[t]):
m.d.sync += self.grant.eq(t)
else:
m.d.comb += self.grant.eq(0)
return m
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